Improvement in shutter-fastenings



chatten tats atwt @ffice BARTLETT DOE, OF BOSTON, MASSACHUSETTS.

Letters .Patent llTo. 76,723, [lated April 14, '1868.

IMPROVEMENT IN SHUTTER-I'ASTBNINGS.

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'.lO ALL WHOM IT' MAY OONCERN:

Be it known that I, BARTLETT DOE, of Boston, in the county of Suffolk, and State of Massachusetts, have invented certain new and useful Improvements in Blind and Shutter-Fasteners; and I. do hereby declare that the following, tahcnin connection with the drawings which accompany and form part of this specification, is a description of my invention suiiieient te enable those skilled in the art to practise it.

The-improvements whieharethe subject 'of this invention arebased upon that classof fasteners, each of which is contained in a metal case, on which a screw-thread, by which the fastener is secured in a plain bored hole made in a blind or shutter, thus dispensing with the use of wood-screws in confining the fastener, and with mortised holes for its reception.

My invention consists, first, in combining with a cylindrical shell 0r case, made in halves, and provided Awith an. external screw-thread, two separate levers, pivoted within said case, and protruding from the ends thereof, the portions ofthe levers which protrude being provided with notches or catches, which can catch upon staples or other suitable devices, while the encased ends of the levers are so arranged, that while the outer lever can be worked by the inner one, the latter cannot be worked hy the former.

A My invention 4also consists in the means by which I unit-c the two halves of the shell; also, inthe form given to the interior of the shell, so that it will not retain 'wat-er; also, in providing the outer lever with a proA jection thereon, having for its object the obstruction of the passage through the fastener-shell, so as to render difficult manipulation oi' the inner lever from without in an attempt to pick the fastening.

Figure l is a central longitudinal section ofthe fastener, taken on the line e c of Figure 2, which is a verA tical section' taken on the line y y, fig. 1. l

The shell is marked a c', and is generally cylindrical, and made in two halves, uniting on the line :a z. The upper part, a, of the shell, is cut partially through at thc top, and at about the middle of its lengt-h, and the shell, being contracted in diameter at the middle, can have applied to it, to hold the two halves together,a metal band,? the ends of which are turned over, and down into the interior of the ease, as shown most clearly in g.2.

The contraction in diameter ofthe shell where the band is applied is chieiiy to let the band pass easily into' the hole bored to receive the fastener.

Instead of the broad metal band, a wire orwires might b e used as ligatures to confine the parts of the shell together, the ends of theligatures being twisted, and turned down into the opening formed in a, so as to be out of the way.

' The inner lever, or the lever which't'astens the blind or shutter in closing an opening, is marked c, and the outer lever, which holds the blind or shutter open, is marked d. These levers are hung on separate pivots, which.

are confined in notches made in a and a, at their juncture, and the short arm of d comes under the short arm of c, as is clearly seen in tig. l, so that while, to lift lever d, the lever c is lifted, yet operations on lever Z can have no effect to lift lever c. i I

On thelever d is a projection, e, which is designed to ll the space within the case, sc as to render it dilriA cult to insert an instrument over the lever d, by which to depress the short end of lever c.

It will be observed that the levers are arranged to operate in catching by gravity alone, without the aid of springs.

The slots in the ends of the case, through which the levers c and d emerge, are continued to the bottom of the ease, which then is made to rise to the centre, so that any rain entering the ease'willrun out again either at one end or the other, and will not lodge, freeze, and obstruct the working of the levers'. v

At the ends of the case the diameters are alike, except that thefscrew-threadsproject s0 aS t0 enter the wood around the bored hole, and except, also, the head, which makes a finish on the-side exposed most torview, and which, if desired, may be made so that a wrench may be applied to screw the case into place.

By cutting awa-y the upper half of the shell, as seen at f, provision is made for securing lthe two ends of 1 i the clasp or band 6,01" for applying spring, which, if used, may be secured to the shell on one side of the.

opening, projecting down into the shell, and bearing uponthe lever cl, as seen by dotted lines in iig. 1.

I claim- 1. The manner ot uniting me two halvesof the cylindrical case, by means of al ligature applied between the ends of the shell, and a. place of less diameter thausaid ends, substantially :is described.

2. Also, giving to tbe lower part of the case the rounded and depessed form shown and described, for the purpose of shedding the min, as described.

3. Also, constructing the upper half' of the shell with the opening f, substantially as and for the purpose set forth.

BARTLETT DOE.

Witnesses:

FRANCIS GoULn, L. H. LATIMER. 

